1 files changed, 124 insertions, 0 deletions
diff --git a/arch/arm/kernel/machine_kexec.c b/arch/arm/kernel/machine_kexec.c
new file mode 100644
index 00000000..e59bbd49
--- /dev/null
+++ b/arch/arm/kernel/machine_kexec.c
@@ -0,0 +1,124 @@
+/*
+ * machine_kexec.c - handle transition of Linux booting another kernel
+ */
+
+#include <linux/mm.h>
+#include <linux/kexec.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/io.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/mmu_context.h>
+#include <asm/cacheflush.h>
+#include <asm/mach-types.h>
+
+extern const unsigned char relocate_new_kernel[];
+extern const unsigned int relocate_new_kernel_size;
+
+extern void setup_mm_for_reboot(char mode);
+
+extern unsigned long kexec_start_address;
+extern unsigned long kexec_indirection_page;
+extern unsigned long kexec_mach_type;
+extern unsigned long kexec_boot_atags;
+
+static atomic_t waiting_for_crash_ipi;
+
+/*
+ * Provide a dummy crash_notes definition while crash dump arrives to arm.
+ * This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
+ */
+
+int machine_kexec_prepare(struct kimage *image)
+{
+	return 0;
+}
+
+void machine_kexec_cleanup(struct kimage *image)
+{
+}
+
+void machine_crash_nonpanic_core(void *unused)
+{
+	struct pt_regs regs;
+
+	crash_setup_regs(&regs, NULL);
+	printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n",
+	       smp_processor_id());
+	crash_save_cpu(&regs, smp_processor_id());
+	flush_cache_all();
+
+	atomic_dec(&waiting_for_crash_ipi);
+	while (1)
+		cpu_relax();
+}
+
+void machine_crash_shutdown(struct pt_regs *regs)
+{
+	unsigned long msecs;
+
+	local_irq_disable();
+
+	atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
+	smp_call_function(machine_crash_nonpanic_core, NULL, false);
+	msecs = 1000; /* Wait at most a second for the other cpus to stop */
+	while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
+		mdelay(1);
+		msecs--;
+	}
+	if (atomic_read(&waiting_for_crash_ipi) > 0)
+		printk(KERN_WARNING "Non-crashing CPUs did not react to IPI\n");
+
+	crash_save_cpu(regs, smp_processor_id());
+
+	printk(KERN_INFO "Loading crashdump kernel...\n");
+}
+
+/*
+ * Function pointer to optional machine-specific reinitialization
+ */
+void (*kexec_reinit)(void);
+
+void machine_kexec(struct kimage *image)
+{
+	unsigned long page_list;
+	unsigned long reboot_code_buffer_phys;
+	void *reboot_code_buffer;
+
+
+	page_list = image->head & PAGE_MASK;
+
+	/* we need both effective and real address here */
+	reboot_code_buffer_phys =
+	    page_to_pfn(image->control_code_page) << PAGE_SHIFT;
+	reboot_code_buffer = page_address(image->control_code_page);
+
+	/* Prepare parameters for reboot_code_buffer*/
+	kexec_start_address = image->start;
+	kexec_indirection_page = page_list;
+	kexec_mach_type = machine_arch_type;
+	kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET;
+
+	/* copy our kernel relocation code to the control code page */
+	memcpy(reboot_code_buffer,
+	       relocate_new_kernel, relocate_new_kernel_size);
+
+
+	flush_icache_range((unsigned long) reboot_code_buffer,
+			   (unsigned long) reboot_code_buffer + KEXEC_CONTROL_PAGE_SIZE);
+	printk(KERN_INFO "Bye!\n");
+
+	if (kexec_reinit)
+		kexec_reinit();
+	local_irq_disable();
+	local_fiq_disable();
+	setup_mm_for_reboot(0); /* mode is not used, so just pass 0*/
+	flush_cache_all();
+	outer_flush_all();
+	outer_disable();
+	cpu_proc_fin();
+	outer_inv_all();
+	flush_cache_all();
+	cpu_reset(reboot_code_buffer_phys);
+}